(Subscript[I, NN])=A((\[LeftBracketingBar]T\[RightBracketingBar])^2)(0)(0)(∫_(-∞)^∞)[f(E)-f(E+eV)dE=A((\[LeftBracketingBar]T\[RightBracketingBar])^2)(0)(0)eV≡(Subscript[G, NN])V,